BUG: RasEnumEntries returns success regardless of buffer size (198801)
The information in this article applies to:
- Microsoft Windows CE 2.0 for the Handheld PC
- Microsoft Windows CE for the Handheld PC, Versions 1.0
This article was previously published under Q198801 SYMPTOMS
On Windows CE, RasEnumEntries is used to list all entry names in a remote access phone book. However, it returns 0 (success) even if you put a zero for the size of the input buffer parameter. The correct behavior should return ERROR_BUFFER_TOO_SMALL.
RESOLUTION
To work around the problem, we can pre-allocate a large buffer to receive phone book entries and use the out parameter "lpcEntries" to enumerate the phone book entries.
Following is sample code:
void OnRasenum()
{
DWORD cb = 0;
DWORD cEntries = 0;
DWORD dwRet;
DWORD i;
TCHAR szBuf[1024];
LPRASENTRYNAME lpRasEntryName = NULL;
// Pre-alloate a sufficient large buffer for 10 phone book entries.
lpRasEntryName = (LPRASENTRYNAME) LocalAlloc(LPTR, 10 *
sizeof(RASENTRYNAME));
if (lpRasEntryName == NULL)
return;
lpRasEntryName->dwSize = sizeof(RASENTRYNAME);
cb = 10 * sizeof(RASENTRYNAME);
dwRet = RasEnumEntries(NULL, NULL, lpRasEntryName, &cb, &cEntries);
if (dwRet == ERROR_BUFFER_TOO_SMALL)
{
LocalFree(lpRasEntryName);
lpRasEntryName = NULL;
lpRasEntryName = (LPRASENTRYNAME) LocalAlloc(LPTR, cb);
if (lpRasEntryName == NULL)
return;
lpRasEntryName->dwSize = sizeof(RASENTRYNAME);
if (RasEnumEntries(NULL, NULL, lpRasEntryName, &cb, &cEntries)
!= 0)
{
LocalFree(lpRasEntryName);
return;
}
}
else if (dwRet != 0)
{
LocalFree(lpRasEntryName);
return;
}
// RasEnumEntries success
wsprintf(szBuf, _T("Phone book entries [%d] in the default \ phonebook:"), cEntries);
MessageBox(NULL, szBuf, _T("RasEnumEntries"), MB_OK);
for(i=0;i < cEntries;i++)
{
wsprintf(szBuf, _T("%s"),lpRasEntryName->szEntryName);
MessageBox(NULL, szBuf, _T("RasEnumEntries"), MB_OK);
lpRasEntryName++;
}
if (lpRasEntryName)
LocalFree(lpRasEntryName);
return;
}STATUSMicrosoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
| Modification Type: | Minor | Last Reviewed: | 4/30/2004 |
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| Keywords: | kbBug kbpending KB198801 |
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